In Struts 2 , you can use following two ways to get the HttpServletResponse object.

1. ServletActionContext

Access HttpServletResponse via ServletActionContext class.

package com.mkyong.common.action;
 
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
 
public class LocaleAction{
	//business logic
	public String execute() {
		HttpServletResponse response = ServletActionContext.getResponse();
 
		return "SUCCESS";
	}
}

2. ServletResponseAware

Access HttpServletResponse by implementing the ServletResponseAware interface and override the setServletResponse() method.

Note
When Struts 2 ‘servlet-config‘ interceptor is seeing that an Action class is implemented the ServletResponseAware interface, it will pass a HttpServletResponse reference to the requested Action class via the setServletResponse() menthod.

Of course, you can create a custom getServletResponse() to get the HttpServletResponse easily.

package com.mkyong.common.action;
 
import java.util.Locale;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.interceptor.ServletResponseAware;
 
public class LocaleAction implements ServletResponseAware{
 
	HttpServletResponse response;
 
	//business logic
	public String execute() {
		Locale locale = getServletResponse().getLocale();
		return "SUCCESS";
	}
 
	public void setServletResponse(HttpServletResponse response) {
		this.response = response;
	}
	public HttpServletResponse getServletResponse() {
		return this.response;
	}	
}

Both mechanism are getting the same HttpServletResponse object, but Struts 2 documentation is recommended to use the ServletResponseAware, see the references below :

References

  1. http://struts.apache.org/2.x/docs/how-can-we-access-the-httpservletresponse.html
  2. http://struts.apache.org/2.1.2/struts2-core/apidocs/org/apache/struts2/interceptor/ServletResponseAware.html
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